add GetError()

on WSAECONNRESET, just return 0, not error
set STATE_SHUTDOWN on shutdown, though nothing uses this right now;
maybe this should be removed, and instead say "always call Close()
at the end of successful processing in the thread" (to ensure that we don't
block later)

stepmania/src/archutils/Win32/CrashHandlerNetworking.cpp

@@ -479,6 +479,7 @@ void NetworkStream_Win32::Shutdown()
 		return;
 
 	shutdown( m_Socket, SD_BOTH );
+	m_State = STATE_SHUTDOWN;
 }
 
 void NetworkStream_Win32::Cancel()
@@ -540,6 +541,10 @@ int NetworkStream_Win32::Read( void *pBuffer, size_t iSize )
 				continue;
 		}
 
+		/* If the other side closed the connection, just return EOF. */
+		if( iError == WSAECONNRESET )
+			break;
+
 		/* If we're cancelled or hit an error while reading, do return the data we managed
 		 * to get.  Be sure not to overwrite CANCELLED with ERROR. */
 		SetError( ssprintf("Error reading: %s", WinSockErrorToString(iError).c_str() ) );
@@ -738,6 +743,11 @@ float NetworkPostData::GetProgress() const
 	return m_fProgress;
 }
 
+RString NetworkPostData::GetError() const
+{
+	return m_pStream->GetError();
+}
+
 void NetworkPostData::SetProgress( float fProgress )
 {
 	m_Mutex.Lock();

stepmania/src/archutils/Win32/CrashHandlerNetworking.h

@@ -28,6 +28,7 @@ public:
 
 	RString GetStatus() const;
 	float GetProgress() const;
+	RString GetError() const;
 	RString GetResult() const { return m_sResult; }
 
 private: